Iactually have no clue how to do this! the sum of three numbers is 855. one of the numbers, x, is 50% more than the sum of the other two numbers. what is the value of x?

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?